Occupant classification ecu malfunction

Dtc b1795 is recorded when a malfunction is detected in the occupant classification ecu.

Troubleshoot dtc b1771 first when dtc b1771 and b1795 are output simultaneously.

1. 1
   Check for dtc
2. 2
   Turn the ignition switch on, and wait for at least 10 seconds.
3. 3
   Check the dtcs (see page rs-249).

Result

Dtcs other than dtc b1771 and b1795 may be output at this time, but they are not related to this check.

1. 1
   Check fuse (ecu-b)
2. 2
   Check the ecu-b fuse from the instrument panel junction block.
3. 3
   Measure the resistance of the fuse.

Standard resistance: below 1

3. Check wire harness (source voltage)

1. 1
   Turn the ignition switch off.
2. 2
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. 3
   Disconnect the no. 2 Floor wire connector from the occupant classification ecu.
4. 4
   Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
5. 5
   Measure the voltage of the wire harness side connector.

Standard voltage

1. 1
   Turn the ignition switch off.
2. 2
   Measure the resistance of the wire harness side connector

standard resistance

1. 1
   Replace occupant classification ecu
2. 2
   Turn the ignition switch off.
3. 3
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
4. 4
   Replace the occupant classification ecu (see page rs- 392).

Perform the inspection using parts from a normal vehicle if possible.

1. 1
   Perform zero point calibration
2. 2
   Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. 3
   Connect the intelligent tester to the dlc3.
4. 4
   Turn the ignition switch on.
5. 5
   Using the intelligent tester, perform the zero point calibration (see page rs-241).

1. 1
   Perform sensitivity check
2. 2
   Using the intelligent tester, perform the sensitivity check (see page rs-241).